CVE-2026-73930 in Helidon
Summary
by MITRE • 08/19/2026
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.3. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. While the vulnerability is in Helidon, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Helidon accessible data as well as unauthorized read access to a subset of Helidon accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 9.9 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L).
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Analysis
by VulDB Data Team • 08/19/2026
The identified vulnerability resides within the Imperative Web Server component of Oracle Fusion Middleware Helidon version 4.5.3, representing a critical security flaw that fundamentally undermines the integrity and availability of the application infrastructure. This issue is characterized by its high ease of exploitation, allowing unauthenticated attackers to leverage network access via HTTP protocols to execute malicious actions against the target system. The severity of this vulnerability is underscored by a CVSS 3.1 Base Score of 9.9, indicating an extremely dangerous risk level that demands immediate attention from security operations teams and infrastructure administrators responsible for maintaining Helidon-based services.
The technical nature of this flaw enables unauthorized creation, deletion, or modification of critical data as well as all accessible data within the Helidon environment. Furthermore, it permits unauthorized read access to a subset of Helidon-accessible data, thereby compromising confidentiality alongside integrity and availability. The operational impact extends beyond the immediate application layer, as attacks exploiting this vulnerability can significantly affect additional products due to scope changes inherent in the architecture of Oracle Fusion Middleware. This lateral movement potential means that a compromise in Helidon could serve as an entry point for broader system infiltration, affecting interconnected services and data stores within the enterprise ecosystem.
From a classification perspective, this vulnerability aligns with CWE-94 Improper Control of Generation of Code or Script, specifically when such code is interpreted by a web server, leading to remote code execution capabilities that facilitate data manipulation and denial of service conditions. In terms of adversary behavior mapping under MITRE ATT&CK, the exploitation vector corresponds to Initial Access via Network Service Exploitation and subsequent actions map to Data Exfiltration for unauthorized read access, Impact through Denial of Service for partial system unavailability, and potentially Persistence or Privilege Escalation depending on the specific implementation details of the server's handling of malformed requests. The combination of high confidentiality impact due to data reading capabilities and high integrity impact due to modification rights creates a multifaceted threat landscape that attackers can exploit with minimal effort.
Mitigation strategies must prioritize immediate patching to version 4.5.3 or later if available, ensuring all instances of the Imperative Web Server are updated across the deployment environment. Organizations should also implement network-level controls such as web application firewalls configured to detect and block anomalous HTTP requests that exhibit patterns consistent with this vulnerability's exploitation vectors. Additionally, restricting direct external access to Helidon endpoints by placing them behind authenticated reverse proxies or API gateways can reduce the attack surface available to unauthenticated actors. Continuous monitoring for signs of data tampering, unauthorized file system changes, and unusual spikes in resource consumption indicative of partial denial-of-service attacks is essential for early detection and response during the remediation window.